Quaker, Lovebird or Something Else?

I recently asked about what species to get next, and based off the responces I got there I am thinking either a quaker or lovebird. I currently have a tiel named Bob.

I do not know which I will get and have a few questions about them. Would they be willing to happily share a play area with Bob (not a cage, just a supervised play space)?
Would they be be more difficult to harness/leash train than Bob (I think the answer would have to be no; I am still working on this with Bob).
Are they good fliers (I have heard that some parrots are poor fliers, and I am sure that Bob will be an excellent one once he molts)
Can these species share a diet with Bob or will I need to get more food; currently Bob eats seeds and pellets, while he is given vegitables and fruits.
How common is it for females of these species to lay unfertilized eggs, and how big of a risk is egg binding?

Once I get it I intend to follow the general rule of quarentining them and this leads me to a couple of additional questions.
I have read conflicting advice on how long to quarentine them for, eight 30 or 60 days, which is it, or is it something else?
While they are in quarentine I believe that I should wash and change clothes (or at least shirts) after handling one bird before handling the other and that they should be kept in seperate rooms. If I do this it seems to me that it will either cut down on the amount of time that Bob and I spend together, or it will cause the new bird to live in relative isolation for an extended period of time. If I cut the amount of time I spend with Bob in half will it harm him psychologically, or if I spend a limited amount of time with the new bird during the quarintine will it hurt him? I currently spend 3-5 hours a day with Bob, except on weekends when it is closer to 8-10.

Responces are not urgent, but they are appreciated. I hoop to actively start looking for another bird in 1-2 months, Bob will be harness trained before I get another bird, and hopefully potty trained too.

I believe that I had more questions, but I do not remember them, I will post them as I do.

I would also recommend a Senegal, Pionus or a Conure.

As I drive in the gorgeous countryside of Md. I see very large estates and wish I could live there. Then I could have lots of birds and of course someone to clean the cages and chop the food. Dream, dream.....................

I forgot to mention, if you spend 3-5 hours a day with Bob, when you get another bird, you will be cutting your Bob time in half.

I too have thought about a second bird and eventhough I'm retired, I'm not sure I want to share the time that I have to spend with my Senegal (Tiki).

Quakers and Tiels can eat the same diet. Penelope, my Quaker, is on a cockatiel pellet diet (plus the good veggies and whatnots). Lovebirds are super good fliers. They're little, feathered rocket ships. I'd say go for a Quaker, because lovebirds, from my experience, get nippy or are super spastic (my Gunter falls into the super spastic category). Penelope was socialized with other birds, and has gotten along with other birds as long as they kept off her stuff. Quakers are territorial though, so make sure that any Quaker and Bob interact on neutral ground. That being said, Quakers are great birds, and can be super lovey.

BanalityBob said:

Quakers and Tiels can eat the same diet. Penelope, my Quaker, is on a cockatiel pellet diet (plus the good veggies and whatnots). Lovebirds are super good fliers. They're little, feathered rocket ships. I'd say go for a Quaker, because lovebirds, from my experience, get nippy or are super spastic (my Gunter falls into the super spastic category). Penelope was socialized with other birds, and has gotten along with other birds as long as they kept off her stuff. Quakers are territorial though, so make sure that any Quaker and Bob interact on neutral ground. That being said, Quakers are great birds, and can be super lovey.

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My original request was for a suggestion of a bird that could share a cage with Bob, tiels and budgies were suggested. I would rather not have a second tiel, and a budgie does not seem right. So any interaction between my birds will happen on a playstand, in some random area in my home or on my shoulders. They will have their own cages.